diff --git a/bootstrap/service.go b/bootstrap/service.go
index 92b3f2a..0c0a476 100644
--- a/bootstrap/service.go
+++ b/bootstrap/service.go
@@ -25,6 +25,9 @@ const (
 	ServiceModeFSMoinitor
 	ServiceModeHealthcheck
 	ServiceModeTempMonitor
+
+	tempChangeMonitorPeriod = 5 * time.Minute
+	ipChangeMonitorPeriod   = 30 * time.Minute
 )
 
 // Main adds standard handlers to the telega bot.
@@ -53,13 +56,13 @@ func Main(runtime string, serviceMode byte) (status string, err error) {
 	if (serviceMode & ServiceModePeriodic) == ServiceModePeriodic {
 		// add periodic tasks
 		log.Println("adding periodic tasks handlers")
-		bot.AddPeriodicTask(30*time.Minute, "Public IP Changed:", feed.PublicIP)
+		bot.AddPeriodicTask(ipChangeMonitorPeriod, "Public IP Changed:", feed.PublicIP)
 	}
 
 	if (serviceMode & ServiceModeTempMonitor) == ServiceModeTempMonitor {
 		// add temperature change monitoring
 		log.Println("adding temperature change monitoring")
-		bot.AddPeriodicTask(5*time.Minute, "Temperature changed:", feed.TemperatureMonitor)
+		bot.AddPeriodicTask(tempChangeMonitorPeriod, "Temperature changed:", feed.TemperatureMonitor)
 	}
 
 	if (serviceMode & ServiceModeFSMoinitor) == ServiceModeFSMoinitor {
diff --git a/feed/temperature.go b/feed/temperature.go
index f9a31d8..eec22b4 100644
--- a/feed/temperature.go
+++ b/feed/temperature.go
@@ -21,11 +21,13 @@ import (
 )
 
 const (
-	sensorDevicePath               = "/sys/bus/w1/devices/28-3c01d607ca0a/w1_slave"
-	errTemp                  int32 = -1000
-	maxRetries                     = 10
-	minRereshInterval              = 5 * time.Second
-	monitoredTemperatureDiff       = 0.5
+	sensorDevicePath                      = "/sys/bus/w1/devices/28-3c01d607ca0a/w1_slave"
+	sensorDevicePathKey                   = "device-path"
+	sensorMinReadingIntervalPathKey       = "min-read"
+	errTemp                         int32 = -1000
+	maxRetries                            = 10
+	minRereshInterval                     = 5 * time.Second
+	monitoredTemperatureDiff              = 500
 )
 
 var (
@@ -88,9 +90,17 @@ func getTemperatureReading(fpath string) (int32, error) {
 }
 
 func getTemperatureReadingWithRetries(ctx context.Context, fpath string, retries int) (temperature int32, timestamp time.Time, err error) {
+
+	var refreshInterval = func() time.Duration {
+		if p, ok := ctx.Value(sensorMinReadingIntervalPathKey).(time.Duration); ok {
+			return p
+		}
+		return minRereshInterval
+	}
+
 	// do not allow more frequent polls
 	lastTimeMutex.RLock()
-	if time.Since(lastTime) < minRereshInterval {
+	if time.Since(lastTime) < refreshInterval() {
 		defer lastTimeMutex.RUnlock()
 		return atomic.LoadInt32(&lastTemp), lastTime, nil
 	}
@@ -131,11 +141,19 @@ func getTemperatureReadingWithRetries(ctx context.Context, fpath string, retries
 }
 
 // TemperatureMonitor 's for temp changes over the threshold
-func TemperatureMonitor(ctx context.Context) (temprature string) {
-	v, _, err := getTemperatureReadingWithRetries(ctx, sensorDevicePath, 10)
+func TemperatureMonitor(ctx context.Context) string {
+	var devicePath = func() string {
+		if p, ok := ctx.Value(sensorDevicePathKey).(string); ok {
+			return p
+		}
+		return sensorDevicePath
+	}
+
+	v, _, err := getTemperatureReadingWithRetries(ctx, devicePath(), 10)
 	if err != nil {
 		return onError("error reading temperature", err)
 	}
+	log.Println("temperature monitor: prev:", monitoredTemperature, "curr:", v)
 	if math.Abs(float64(v-monitoredTemperature)) > monitoredTemperatureDiff {
 		monitoredTemperature = v
 		return fmt.Sprintf("%.1f ℃ 🌡", float32(v)/1000.0)
diff --git a/feed/temperature_test.go b/feed/temperature_test.go
index 3eee278..dd2f7c7 100644
--- a/feed/temperature_test.go
+++ b/feed/temperature_test.go
@@ -3,6 +3,7 @@ package feed
 import (
 	"context"
 	"os"
+	"path"
 	"strings"
 	"testing"
 	"time"
@@ -67,3 +68,38 @@ func Test004_tempParseFilePersistent(t *testing.T) {
 	assert.NoError(t, err)
 	assert.Equal(t, int32(29812), v)
 }
+
+func Test005_tempMonitorChanges(t *testing.T) {
+
+	const (
+		datapath = "temp_sensor_readings/"
+		t88      = "28_8c"
+		t95      = "29_5c"
+		t98      = "29_8c"
+		tr28     = "32_8c"
+		m108     = "minus_10_8_c"
+		m104     = "minus_10_4_c"
+	)
+
+	var noDelayCtx = func() context.Context {
+		return context.WithValue(context.Background(), sensorMinReadingIntervalPathKey, 1*time.Nanosecond)
+	}
+
+	ctx := context.WithValue(noDelayCtx(), sensorDevicePathKey, path.Join(testDataDir, datapath, t98))
+	assert.True(t, strings.HasPrefix(TemperatureMonitor(ctx), "29.8"))
+
+	ctx = context.WithValue(noDelayCtx(), sensorDevicePathKey, path.Join(testDataDir, datapath, t95))
+	assert.Empty(t, TemperatureMonitor(ctx))
+
+	ctx = context.WithValue(noDelayCtx(), sensorDevicePathKey, path.Join(testDataDir, datapath, t88))
+	assert.True(t, strings.HasPrefix(TemperatureMonitor(ctx), "28.8"))
+
+	ctx = context.WithValue(noDelayCtx(), sensorDevicePathKey, path.Join(testDataDir, datapath, tr28))
+	assert.True(t, strings.HasPrefix(TemperatureMonitor(ctx), "32.8"))
+
+	ctx = context.WithValue(noDelayCtx(), sensorDevicePathKey, path.Join(testDataDir, datapath, m108))
+	assert.True(t, strings.HasPrefix(TemperatureMonitor(ctx), "-10.8"))
+
+	ctx = context.WithValue(noDelayCtx(), sensorDevicePathKey, path.Join(testDataDir, datapath, m104))
+	assert.Empty(t, TemperatureMonitor(ctx))
+}
diff --git a/telega/bot.go b/telega/bot.go
index 66221f2..00d1495 100644
--- a/telega/bot.go
+++ b/telega/bot.go
@@ -316,8 +316,10 @@ func (b Bot) Run() (string, error) {
 
 func (b *Bot) processPeriodicTasks(chatIDs []int64) {
 	b.periodicTaskCycle++
+	log.Println("bot: processing periodic tasks")
 	for _, h := range b.periodicTasks {
-		if b.periodicTaskCycle/h.interval == 0 {
+		log.Println("bot: executing periodic task", h.intro, b.periodicTaskCycle, h.interval, (b.periodicTaskCycle % h.interval))
+		if b.periodicTaskCycle%h.interval == 0 {
 			notificationMessageWrapper(b.ctx, h.intro, h.fn, b.bot, chatIDs)
 		}
 	}
diff --git a/testdata/temp_sensor_readings/28_8c b/testdata/temp_sensor_readings/28_8c
new file mode 100644
index 0000000..6301854
--- /dev/null
+++ b/testdata/temp_sensor_readings/28_8c
@@ -0,0 +1,2 @@
+dd 01 55 05 7f a5 a5 66 81 : crc=81 YES  
+dd 01 55 05 7f a5 a5 66 81 t=28812 
diff --git a/testdata/temp_sensor_readings/29_5c b/testdata/temp_sensor_readings/29_5c
new file mode 100644
index 0000000..a3002b6
--- /dev/null
+++ b/testdata/temp_sensor_readings/29_5c
@@ -0,0 +1,2 @@
+dd 01 55 05 7f a5 a5 66 81 : crc=81 YES  
+dd 01 55 05 7f a5 a5 66 81 t=29512 
diff --git a/testdata/temp_sensor_readings/29_8c b/testdata/temp_sensor_readings/29_8c
new file mode 100644
index 0000000..24a12d6
--- /dev/null
+++ b/testdata/temp_sensor_readings/29_8c
@@ -0,0 +1,2 @@
+dd 01 55 05 7f a5 a5 66 81 : crc=81 YES  
+dd 01 55 05 7f a5 a5 66 81 t=29812 
diff --git a/testdata/temp_sensor_readings/32_8c b/testdata/temp_sensor_readings/32_8c
new file mode 100644
index 0000000..b2d1a69
--- /dev/null
+++ b/testdata/temp_sensor_readings/32_8c
@@ -0,0 +1,2 @@
+dd 01 55 05 7f a5 a5 66 81 : crc=81 YES  
+dd 01 55 05 7f a5 a5 66 81 t=32812 
diff --git a/testdata/temp_sensor_readings/minus_10_4_c b/testdata/temp_sensor_readings/minus_10_4_c
new file mode 100644
index 0000000..b79f9a5
--- /dev/null
+++ b/testdata/temp_sensor_readings/minus_10_4_c
@@ -0,0 +1,2 @@
+dd 01 55 05 7f a5 a5 66 81 : crc=81 YES  
+dd 01 55 05 7f a5 a5 66 81 t=-10412
diff --git a/testdata/temp_sensor_readings/minus_10_8_c b/testdata/temp_sensor_readings/minus_10_8_c
new file mode 100644
index 0000000..96c526a
--- /dev/null
+++ b/testdata/temp_sensor_readings/minus_10_8_c
@@ -0,0 +1,2 @@
+dd 01 55 05 7f a5 a5 66 81 : crc=81 YES  
+dd 01 55 05 7f a5 a5 66 81 t=-10801